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I have noticed that on StarLink some sites behind CF go into "prove you are human" loops that are impassable.

What causes such loops? Just a challenge over and over.

> Just a challenge over and over.

It must be intentional. Not unlike the endless loop of frustratingly slow-fading reCAPTCHA challenges that don't go anywhere. The user gives up after some time, but doesn't see any explicit error or page blocking their access. I imagine it must be quite effective.

in my opinion, the admins do not enable the option to ban lower trust users (or set the threshold high), so CF tries over and over again instead of doing that.

There’s a patent for that. The catchpa loop is basically a honeypot for bots… and privacy-conscious legitimate folks.

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